NEW HAVEN, Conn. — A train-commuter leader has launched an online effort, including social media, to air complaints directly to Metro-North Railroad and elected officials, saying commuters are fed up after recent derailments, service outages and stranded passengers.

Jim Cameron says the Commuter Action Group is encouraging commuters to immediately report problems such as late trains and lack of heat directly to the railroad and copy the complaint via e-mail to their elected official.

Complaints also are being tweeted to Metro-North.

The campaign comes after a train derailment at the Spuyten Duyvil station in The Bronx in December that killed four passengers and a derailment in May in Bridgeport that injured 73 passengers.

Passengers were stranded twice last week by a power outage and downed wires.